Subtract 15/36 from 5/42, Solve 5/42

Subtract 15/36 from 5/42

5/42 - 15/36 is -25/84.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 36 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 42 × 6 = 252,
5/42 = 5 × 6/42 × 6 = 30/252
Likewise, for the 2nd fraction, since 36 × 7 = 252,
15/36 = 15 × 7/36 × 7 = 105/252
Subtract the two like fractions:
30/252 - 105/252 = 30 - 105/252 = -75/252
After reducing the fraction, the answer is -25/84

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